Note: Always backup your profile before you add new toolbar setups.
To backup your profile just copy the opera folder which is present in the C:\Documents and Settings\username\Application Data\Opera, and place it some where else, so that you can always copy this folder back to restore the original settings.
Open Opera and press F1 to go to opera help. In opera help, click on the toolbar link, which will open the toolbar help .At the bottom,you will be able to see the link, Download toolbar setups. Just click on it and then you will be led to a download page which will contain a lot of toolbar setups. Just click the download button in any one of them and then you will be able to view the preview ,Just give ok ,if you want the toolbar setup, else give cancel.